Were Hans kammler, Gestapo Muller and Martin Bormann Soviet agents?

All three disappeared after ww2 and it is confirmed none of them went to south america. So the only places left in the world where they could go would be europe, America and soviet union, all of whom had many reasons to arrest these men and bring them before court of law. Yet except for Bormann, who was sentenced in absentia, none of the other two were even mentioned at nuremberg trials. was it because they had already switched sides?